<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
<form action="calc/sum" method="post">
  <h1>计算器</h1>
  数字1：<input name="num1" type="text" ><br>
  数字2：<input name="num2" type="text" ><br>
  <input type="submit" value=" 点击相加 ">
</form>
</body>

</html>